Hi, This option has not been properly maintained lately. So it may have problems when running with trunk. It was developed for X10 2.2 and was mostly tested with r22646. It has some limitations that we described in our PPoPP'12 paper "A Work-Stealing Scheduler for X10?s Task Parallelism with Suspension". It also has a few bugs: it does not handle complicated loops properly and shortcut assignment operators.
No change is required to the program. In fact, it is designed to deliver better performance than the default scheduler in the presence of many small tasks. With sequential programs or programs with few large tasks, it performs worse however. As usual, X10_NTHREADS needs to be set to the number of cores available to each place (no change). Olivier Sparsh Mittal <sparsh0mit...@gmail.com> wrote on 04/15/2013 10:26:31 AM: > From: Sparsh Mittal <sparsh0mit...@gmail.com> > To: x10-users@lists.sourceforge.net > Date: 04/15/2013 10:35 AM > Subject: [X10-users] Inquiring about how to properly x10's work- > stealing scheduler > > Hello > > I saw: > > There is an experimental Cilk-style workstealing scheduler available > in recent X10 releases (use x10c++ -WORK_STEALING=true to compile > your program), however it is still in development and may have > implementation limitations that prevent it from working on some > input programs. > > I wanted to use this scheduler. I have a program which does say 10, > 000 tasks. I have parallelized it using say 8 threads. > > Each task is independent and there is no communication required for > solving any task. There is no dependency b/w tasks. Once my program > is written, I can use > x10c++ -WORK_STEALING=true Program.x10 > > I wanted to ask, does my program have to spawn 4 threads and > distribute the tasks specifically & individually to them and use - > WORK_STEALING=true option; or is there any other way to use this > work-stealing scheduler. In other words, how do I use this scheduler? > > I will be thankful for your reply. > Thanks and Regards > Sparsh Mittal > ------------------------------------------------------------------------------ > Precog is a next-generation analytics platform capable of advanced > analytics on semi-structured data. The platform includes APIs for building > apps and a phenomenal toolset for data science. Developers can use > our toolset for easy data analysis & visualization. Get a free account! > http://www2.precog.com/precogplatform/slashdotnewsletter > _______________________________________________ > X10-users mailing list > X10-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/x10-users ------------------------------------------------------------------------------ Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis & visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter _______________________________________________ X10-users mailing list X10-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/x10-users
